Spirit-level.



No. 794,865. PATBNTBD JULYl 1e, 1905.

' P. KAUFMANN. SPIRIT LEVEL.

APPLICATION FILI-2D APB.. 8, 1904.

@'94 #Trug-E E' l 7??,

Patented 'July 18, 1905.

PATENT OEEICE.

PETER KAUFMANN, OF PORTLAND, OREGON.

SPIRIT-LEVEL.

SPECIFICATION forming part of Letters Patent No. 794,865, dated July 18,1905.

Application led April 8, 1904. Serial No. 202,216.

To all wiz/0m, t may concern:

Be it known that I, PETER KAUFMANN, a citizen of the United States,residing' at Portland, in the county of Multnomah and State of Oregon,have invented a new and useful Spirit- Level, of which the following isa specieation.

This invention is an improved construction of spirit-level, the objectbeing to provide a cheap, simple, and efficient device in which thespirit-tube can be quickly and easily adjusted :for the purpose ofrendering the level absolutely accurate.

Spirit-levels as usually constructed have no means for readjusting thespirit-tube, and it is a well-known fact that levels frequently becomeinaccurate owing to the expansion or contraction of the metal parts orthe Warping of the wooden stock or from a sudden jar or fall.Furthermore, these ordinary spiritlevels have no convenient means forreadjustment, and the usefulness of the device as an accurate tool isconsequently impaired.

The object of my invention is therefore to avoid these objections; andwith this object in View my invention consists, essentially, in theemployment of a spirit-tube holder arranged within an opening in thestock,together with adjustable means for securing said tubeholder withinsaid opening.

The invention consists also in certain details of constructionhereinafter fully described, and pointed out in the claim.

In the drawings forming a part of this specification, Figure l is aperspective View of a spirit-level constructed in accordance with myinvention. Fig. 2 is a transverse vertical section on the line 2 2 ofFig. 3. Fig. 3 is a vertical longitudinal sectional View on the line 3 3of Fig. 2, and Fig. 4 is a horizontal sectional view on the line 4 4 ofFig. 3.

In constructing a spirit-level in accordance with my invention I employa stock A, preferably of wood and having an essentially rectangularopening A at the center of the same, and fitting in said opening is anessentially rectangular-shaped metal frame B, which is securely held inplace by means of screws O, passing through the top and bottom of the lstock into the frame, as most clearly shown in Fig. 3. The side membersof the frameB are preferably provided with openings B', in which restthe ends of the cylindrical spirittube holder D, said tube-holder beingopened at both ends and has the spirit-tube E arranged therein, the topand bottom sides of the said tube-holder being cutaway, as shown at D',in order to expose the bubble E in the spirit-tube E. This tube issecurely held at the proper point in the holder by means of any suitableadhesive.

Passing vertically through the tube-holder D andr beyond the ends of thespirit-tube are the threaded rods F, the ends of which are fastened inthe top and bottom sides of the frames, and jam-nuts G are arranged uponthe said threaded rods and adapted to bear against the frame andsecurely hold the said rods from turning. Nuts H are arranged u pon therods Fabove and below the holder D and securely hold said holder in itsproper posi.- tion, and it is obvious that by adjusting' these nuts thespirit-tube can be accurately-adjusted, so that the bubble will appearexactly at the center when the stock is perfectly level.

By having the tube-holder cut away upon the top and bottom sides thelevel is reversiblethat is, it can be used either side up. After thespirit-tube has been once accurately adjusted it is obvious that it canbe quickly readjusted should it become deranged from any cause whatever.

Having thus fully described my invention, what I claim as new, anddesire to secure by Patent, is-

A spirit-level comprising astock having an opening therein, a framearranged vin said opening, a cylindrical tube-holder arrangedhorizontally within the frame, a spirit-tube arranged in the holder, thethreaded rods liXed in the frame, and passing through the tubeholder,and the nuts upon the rods above and below the tube-holder for thepurpose set forth.

PETER KAUFMANN. Witnesses:

FRANK A. GRANT, JAS. R. KAHLER.

